Audi, A6, C4, 2.8 (1994-) Common Issues
1. Oil leaks from valve cover gasket
Occurrence: 20%Cost to repair: $300Symptoms:
Blue or green oil spots under the engine, increased oil consumption
2. Faulty oxygen sensor
Occurrence: 15%Cost to repair: $250Symptoms:
Check Engine Light on, rough engine idle, poor fuel efficiency
3. Transmission solenoid pack failure
Occurrence: 12%Cost to repair: $1200Symptoms:
Unusual transmission noises, slipping or hesitation when shifting gears
4. Faulty water pump
Occurrence: 10%Cost to repair: $800Symptoms:
Overheating engine, increased coolant consumption
5. Low compression due to piston ring or cylinder wear
Occurrence: 9%Cost to repair: $1500Symptoms:
Decreased engine performance, rough idle, excessive oil consumption
6. Faulty Mass Airflow Sensor (MAF)
Occurrence: 8%Cost to repair: $200Symptoms:
Check Engine Light on, poor engine performance, decreased fuel efficiency
7. A/C system leaks
Occurrence: 7%Cost to repair: $600Symptoms:
Air conditioning not blowing cold air, water or ice in the cabin
8. Faulty catalytic converter
Occurrence: 6%Cost to repair: $1000Symptoms:
Check Engine Light on, decreased engine performance, increased emissions
9. Rear main seal failure
Occurrence: 5%Cost to repair: $900Symptoms:
Oil leaks onto the exhaust system or rear axle
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